Draft device.



P-ATBNTED MAR. 31, 1903'.

' :r. v. ELLIOTT.

DRAFT DEVICE.

APPLICATION FILED JULY 3, 1902.

no MODEL,

' INVENTOR Hacienda VEZZZOZfi ATTUH/VfYS.

WITNESSES.

UNITED STATES ATYENT mm."

TIIADIOUS VENSON ELLIOTT, OF COLUMBIA, PENNSYLVANIA, ASSIGNOR OFONE-HALF TO JOHN B. HUTCHINSON, OF COLUMBIA, PENNSYL- VAN IA.

DRAFT DEVICE.

SPECIFICATION forming part of Letters Patent No. 724=,272, dated March31, 1903.

Application filed July 3,1902. Serial No. 114,221. (No model.)

To aZZ whom it may concern:

Be it known that I, THADIOUS VENsoN EL- LIOTT, a citizen of the UnitedStates, and a resident of Columbia, in the county of Lancaster and Stateof Pennsylvania, have made certain new and useful Improvements in DraftDevices, of which the following is a specification.

My invention is an improved draft device for furnace-stacks; and itconsists in certain novelconstructions and combinations of parts, aswill be hereinafter described and claimed. In the drawings, Figure l isalongitudinal section of a furnace, showing the device as in use. Fig. 2is a detail vertical longitudinal section of the nozzle. Fig. 3 is adetail perspective view showing the series of expansion-chambers and thenozzle, and Fig. 4: is a detail section enlarged.

By my invention I provide in the stack of the furnace a draft deviceconsisting of a series of concentric sections in connection with anozzle discharging into the lowermost section, each of the concentricsections being slightly larger than the preceding one and the lower orreceiving end of each section being flared slightly outward and theupper or discharge end of each section being flared slightly outward andthe outwardly-flared end of each section fitting within theoutwardly-flared end of the next-succeeding section, so each sectionwill discharge freely to the succeeding section and the flare at thelower end of each succeeding section will permit the entrance of alimited amount of air, smoke, or other contents of the stack, as may bedesired.

By my invention I discharge into the lower end of the series ofsections, which gradually enlarge, steam and air in such manner as toproduce a blast or forced draft, which will expand successively in theseveral sections and will operate by compound expansion to produce astrong upward draft within the stack, the smoke, gases, steam, &c., ineach section of the device discharging into and expanding within thelarger succeeding section, as will be understood from Figs. 1 and 3 ofthe drawings.

In the construction shown the draft device includes a series of sections1, 2, 3, and at, the

upper end of each section being flared outwardly at 5, and projectingslightly within the lower end of the next upper section, which lower endis flared outwardly at 6, and the nozzle B discharges into the lowersection 1, which section is of less diameter than the succeeding section2, which in turn is smaller than the section 3, and so on to the end ofthe series, the device involving,-as.shown, four sections; butmanifestly the number may be varied as desired. In supporting the draftdevices in the stack 0, I prefer to provide arms D, connected at theirinner ends with the upper section 4 and at their outer ends to thestack, and to provide the sections 2, 3, and4 with straps E, extendingbelow their lower ends and entering boxes F on the next lower section,wherein they may be socured by clamping-screws f in any desiredadjustment. By this construction the sections may be adjusted into anydesired relation and secured in such relation, as may be desired.

The nozzle B discharges at its upper end B into the lower section 1 andmay be supported from section 1 .by the stgap G, secured adj ustably tothe nozzle B at G, as shown in Fig. 2. This nozzle has a chamber H atits lower end, into which steam is discharged at H under control of thepin-valve H air being admitted at H to the chamber to mix with thesteam, the steam operating to draw the air, smoke, 850., into the nozzleand force the same out of the upper end of the nozzle, where the latteris provided with a spreader I, which may include a central inverted cone1 and bars 1*, connecting such cone with the body of the nozzle. Steamis supplied through the pipe J, leading from the dome of the boiler.

By the use of the described construction a strong upward draft will becaused in the stack 0, which may be regulated by proper adjustment ofthe valve H and where desired a valve K may be provided to throttle orcontrol the discharge of steam through the pipe J.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. The combination substantially as herein described with thefurnace-stack of the draft device supported therein and consisting of anupright series of tubular sections, each section being larger than thenext lower section and provided on said sections with loops or boxes andwith straps extending from the next upper section and adjustably securedin said loops or boxes, straps connecting the upper section with thestack, the nozzle discharging into the lower section and the upper andlower ends of the adjacent sections being flared outwardly substantiallyas set forth.

2. A draft device for furnace-stacks comprising a series of concentrictubular sections arranged in succession, each section being larger thanthe preceding section and the discharge end of each section and thereceiving end of the succeeding section being flared outwardly,substantially as set forth.

3. A draft device comprising a plurality of I succeeding sections, thedischarge end of one section being flared outwardly and pro3ect- 4. In adraft device the combination of a series of sections in which eachsection is provided at its receiving end with projecting straps and thepreceding sections are provided with means for adj ustably securing saidstraps whereby the sections are secured together substantially as setforth.

5. A draft device comprising a series of tubular concentric sectionssucceeding each other and in which each section is larger than thepreceding section and the receiving end of each section and thedischarge end of the preceding section are flared outwardlysubstantially as set forth.

THADIOUS VENSON ELLIOTT.

Witnesses:

J. B. HUTOHINSON, JAMES R. PEARCE.

